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#1
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Pneumatic Shocks for a Russian UAZ Simbir
Hi all,
I own a Russian SUV, a consumer version based on their military jeep series. It has a ton of unsprung weight (solid axles front and back built pretty heavy). The Russian's use oil-based shocks on their cars for the most part, this vehicle included. The large amount of unsprung weight plus the use of oil based shocks seems to be causing excesive "jiggling" whenever we run across one of the many bumps here in Armenia. I've had the shocks re-worked recently (rubber seals replaced, oil replaced), and tried various levels of air pressure in the tires but am pretty much at a dead end there. I'm considering trying to get pneumatic shocks instead. They don't make them for this vehicle, so I'd have to either find a similar vehicle (not necessarily so hard since they tended to copy a lot from Toyota) or order some custom shocks. Questions: 1) Are pneumatic shocks better for a heavy vehicle, specifically one with significant unsprung weight? 2) How would I go about determining if a another vendor's shocks would work on my vehicle? 3) If I need to order custom shocks I ned some recommendations on vendors... Thanks all, B. Jetter - without the x's at: |
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#2
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Pneumatic Shocks for a Russian UAZ Simbir
> wrote in message ups.com... > Hi all, My response is not an answer to your post, but a show of interest. Maybe someone with a lot more knowledge about this sort of situation can give you better help. I have earmarked this thread so I can follow it... Are you able to purchase a wide selection of shock absorbers in Armenia? If one could, and the cost were not exhorbitant, I might be tempted to cobble up some new brackets and adapt multiple shock installations where possible. (Although this would be an exercise in trial and error, and might not achieve anything at all.) |
#3
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Pneumatic Shocks for a Russian UAZ Simbir
> wrote:
> >I own a Russian SUV, a consumer version based on their military jeep >series. It has a ton of unsprung weight (solid axles front and back >built pretty heavy). The Russian's use oil-based shocks on their cars >for the most part, this vehicle included. > >The large amount of unsprung weight plus the use of oil based shocks >seems to be causing excesive "jiggling" whenever we run across one of >the many bumps here in Armenia. I've had the shocks re-worked recently >(rubber seals replaced, oil replaced), and tried various levels of air >pressure in the tires but am pretty much at a dead end there. The notion here is that the oil shocks are tuned to a particular frequency and the frame of the vehicle has a natural resonant frequency as well, and the two points need to be far apart from one another. >I'm considering trying to get pneumatic shocks instead. They don't >make them for this vehicle, so I'd have to either find a similar >vehicle (not necessarily so hard since they tended to copy a lot from >Toyota) or order some custom shocks. Or make some adaptors. But first, you probably want to find out what putting them on is going to do to the system resonance, and if your effective damping will be getting better or worse. First thing I'd do is try varying the viscosity of the oil in the oil shocks and see how the ride changes. That at least will tell you what direction you need to be going in. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
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Pneumatic Shocks for a Russian UAZ Simbir
> wrote:
> >Are you able to purchase a wide selection of shock absorbers in Armenia? If >one could, and the >cost were not exhorbitant, I might be tempted to cobble up some new brackets >and adapt multiple >shock installations where possible. (Although this would be an exercise in >trial and error, and might >not achieve anything at all.) I think this IS a good idea, but you need to be careful about the shocks that you pick. I think if you pick three different sets of shocks that are far enough apart, you might be able to figure out what basic range you want to be in. You might ALSO consider variable gas shocks, which would give you a lot of options to tweak things. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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Pneumatic Shocks for a Russian UAZ Simbir
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#6
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Pneumatic Shocks for a Russian UAZ Simbir
"*" > wrote in message news:01c6b033$362123c0$d696c3d8@race... > > You REALLY cannot tell much by "seat-of-the-pants" trial and error. > > There MAY be a professional race team in Armenia that owns a shock absorber > dynamometer. THAT is the tool that gives you shock pressure comparison > information. > > Without a dyno, it will be difficult - if not impossible - to "tune" your > shocks. Admittedly, all the bells and whistles equipment and software make this sort of project much much easier. To say that it is impossible to revamp one's shock system without it goes against the spirit of the hot rodder. Difficult and time consuming...that is more like it. Unfortunately, in many countries, there is a lack of almost every part, tool, and equipment except resourcefulness. One works with what one has. I have never been to Armenia, and have no idea what is available, but wish you the best in your project. |
#7
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Pneumatic Shocks for a Russian UAZ Simbir
>
> To say that it is impossible to revamp one's shock system without it goes > against the > spirit of the hot rodder. Difficult and time consuming...that is more like > it. Thanks for the encouragement. This is definitely a part of the world for trial and error. The current rear shocks come from the Soviet military jeep stock; the front shocks come from a Volga car - and that's standard from the factory. Somehow I doubt I can do much worse :-) > > Unfortunately, in many countries, there is a lack of almost every part, > tool, and equipment > except resourcefulness. One works with what one has. > > I have never been to Armenia, and have no idea what is available, but wish > you the best > in your project. |
#8
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Pneumatic Shocks for a Russian UAZ Simbir
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#9
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Pneumatic Shocks for a Russian UAZ Simbir
> I have to ask if there's a communication barrier here. when you say > this Russian Jeep-like vehicle uses "oil shocks" and then go on to say > that they are rebuildable, does that mean that they are the older type, > lever-arm shocks? and you are considering retrofitting what were > called "aircraft-type" tubular shocks back when they were first > introduced? I have to admit knowing nothing about any Russian vehicle > except that they had a limo that looked scarily like a stretched > version of a '56 Packard > > nate Nate, The shocks are probably better discribed as "liquid" - some type of oil, but I've never seen the oil, so let's just say it's carbon based. By rebuilding, I mean the seals replaced, some type of valve inside adjusted for flow, and the "oil" flushed and refilled. Afraid I don't know the term "tubular shocks", although the picture at http://www.vanpeltsales.com/FH_web/F...47-48_Tube.jpg looks almost exactly like my shocks. Thanks, Brian |
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